Alzheimer's Research UK makes the case that the everyday habits people associate with heart health - moving more, eating better, not smoking - do double duty for the brain. Staying active keeps blood pumping efficiently, which delivers oxygen and nutrients to brain tissue. Research cited by the charity suggests people who exercise regularly tend to have healthier brains with less damage to the small blood vessels, and the NHS notes that exercise also triggers endorphins that ease stress and lift mood.
The evidence goes beyond general wellbeing. In a US study of more than 2,000 volunteers over 65, participants reported their diet, physical activity and how often they took part in mentally stimulating pursuits. Those who scored well on all three lived longer, and among those who did develop Alzheimer's, onset tended to come at an older age. A Chinese study following 500,000 people for a decade found that ordinary activity counted too: walking for pleasure, DIY and housework were all linked to lower dementia risk.
Blood pressure emerges as a particular pressure point. The Insight 46 study found that blood pressure changes in a person's 40s and 50s were associated with more signs of blood vessel damage in the brain by their 70s. That timeline matters because the brain changes underlying diseases like Alzheimer's can begin decades before memory or thinking problems appear, which is why Alzheimer's Research UK stresses that the 30s, 40s and 50s are a critical window.
The practical takeaway from the charity is less about overhauling your life than finding versions of healthy habits you will actually stick with - dancing in the kitchen rather than joining a gym, or reworking familiar recipes to cut back on saturated fat and sugar, both of which research links to raised risk of heart disease and dementia. Enjoyment, the argument goes, is what turns a short-lived resolution into a decades-long habit.